(3aS,6S,7S,7aS)-6-benzyloxy-2,2-dimethyl-7-(tert-butyldimethylsilyl)oxy-tetrahydro-1,3-dioxolo[4,5-c]pyran

ethyl (3R,4R,5S,6S)-4-(tert-butyldimethylsilyl)oxy-7-(tert-butyldiphenylsilyl)oxy-5,6-(dimethylmethylenedioxy)-3-methylheptanoate

1-[10-(2-benzyloxy)ethyl-13-(tert-butyldimethylsilyl)oxy-13-methyl-1,7,9-trioxadispiro[5.1.5.2]pentadec-2-yl]-5-(tert-butyldimethylsilyl)oxy-5-[5-(tert-butyldiphenylsilyloxymethyl)-2,2-dimethyl-1,3-dioxolan-4-yl]-4-methylpentan-2-one